<!DOCTYPE html>
<html lang="en">

<head>
  <meta charset="UTF-8" />
  <meta http-equiv="X-UA-Compatible" content="IE=edge" />
  <meta name="viewport"
    content="width=device-width, initial-scale=1, maximum-scale=1,minimum-scale=1, user-scalable=no" />
  <title>首页</title>
  <link rel="shortcut icon" href="./favicon.ico" type="image/x-icon" />
  <link rel="stylesheet" href="./_index.scss">
</head>
<style>
  .box {
    width: 100px;
    height: 100px;
    outline: 1px solid #f00;
  }

  .bo {
    width: 100%;
    height: 100px;
    line-height: 100px;
    text-align: center;
    background: #000;

  }
</style>

<body>
  <div class="box">
    <div class="bo">12</div>
  </div>
</body>

</html>